public static Expression <Func <T1, bool> > GetWhereExpression <T1>(ISelect <T1> select, DynamicFilterInfo filter)
{
var properties = filter.Field.Split('.');
var tree = TableRefTree.GetTableRefTree(select, properties.Length, properties);
// 检索
var treeList = GetTreeList(tree).ToList();
var deepest = treeList.Last();
var collectionNodes = treeList.Where(a => a.TableRef.RefType == TableRefType.OneToMany || a.TableRef.RefType == TableRefType.ManyToMany).ToList();
if (deepest.Level != properties.Length)
{
throw new Exception($"当前类型{typeof(T1)}导航属性{filter.Field}匹配检索失败");
}
if (collectionNodes.Count == 0)
{
throw new Exception($"当前类型{typeof(T1)}导航属性{filter.Field}不包含{TableRefType.OneToMany}或者{nameof(TableRefType.ManyToMany)}关系");
}
var selectMethod = typeof(FreeSqlGlobalExtensions).GetMethods().First(a => a.ContainsGenericParameters && a.GetParameters().Count() == 1);
var parameterExpression = Expression.Parameter(typeof(T1), "t");
var manyLevel = 0;
var exp = GetWhereExpression(select, deepest, filter, properties, null, ref manyLevel);
return(exp as Expression <Func <T1, bool> >);
}
public static ISelect <T1> IncludeLevel <T1>(this ISelect <T1> select, int level)
{
var tree = TableRefTree.GetTableRefTree(select, level);
return(select.IncludeLevel(level, tree));
}